Json Parser in C++ (single level

jsonparser.cpp

//find the range of the value of a field by its id in JSON or NULL if not found. example:
// field          "id"             //including the " chars!
// json           {"id": 417}
// response       {7,9}
// String values are returned excluding their surrounding "
// This only works for single level json and array's are  not supported.
int *findJsonFieldRange(const char *json, const char *field) {
    int jsoni = 0;
    int fieldi = 0;

    //search for the field name. End when the full name is read.
    while (1) {
        if (json[jsoni] == field[fieldi])
            fieldi++;
        else
            fieldi = 0;
        jsoni++;
        if (field[fieldi] == '\0')
            break; //jsoni is now at the char after the field in the json. This must be a " char.
        if (json[jsoni] == '\0')
            return NULL; //field name not found
    }

    jsoni++;

    //skip all whitespaces : to get to the value.
    while (json[jsoni] == ' ' || json[jsoni] == '\t' || json[jsoni] == ':')
        jsoni++;

    int valueBegin = jsoni;
    bool quoteTerminated = json[jsoni] == '"';
    if(quoteTerminated)
        valueBegin++;
    jsoni++;

    while (1) {
        if (quoteTerminated) {
            if (json[jsoni] == '"' && json[jsoni - 1] != '\\')
                break;
        } else {
            if (json[jsoni] == ',' || json[jsoni] == '}'){
                break;
            }
        }
        jsoni++;
        if (json[jsoni] == '\0')
            return NULL; //field name not found
    }
    jsoni--; //the last char should not be included
    int* out = new int[2];
    out[0] = valueBegin;
    out[1] = jsoni;
    return out;
}

int main() {
    const char *in = "{\"id4id\": 41.7, \"id2\": \"123\", \"id4\": \"aaa\\\"bbb\\\"ccc\"}";
    int *result = findJsonFieldRange(in, "\"id4\"");
    if(result != NULL)
        for(int i = result[0]; i <= result[1]; i++){
            printf("%c", in[i]);
        }
}